In this video

With the stairs fully constructed, the railing system is added for safety and aesthetics. This begins with installing sturdy vertical posts at the corners of the landing and at the top and bottom of the staircase, typically made from 4x4 or larger pressure-treated lumber. These posts are securely anchored to the landing frame and stringers, ensuring they are plumb and rigid. Horizontal top and bottom rails are then cut and attached between the posts. Balusters (vertical pickets, often 2x2 lumber) are cut to the appropriate length and spaced according to local building codes (usually a maximum of 4 inches between balusters) and fastened between the top and bottom rails. Finally, a comfortable handrail is installed on top of the baluster assembly, providing a continuous grasping surface. All components are fastened with weather-resistant screws or nails. The video shows the installation of these elements leading to the completed staircase with railings.